2840540 has 24 divisors (see below), whose sum is σ = 6024480. Its totient is φ = 1124928.

The previous prime is 2840507. The next prime is 2840549. The reversal of 2840540 is 450482.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2840549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1529 + ... + 2831.

It is an arithmetic number, because the mean of its divisors is an integer number (251020).

2^2840540 is an apocalyptic number.

2840540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2840540 is an abundant number, since it is smaller than the sum of its proper divisors (3183940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2840540 is a wasteful number, since it uses less digits than its factorization.

2840540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421 (or 1419 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 2840540 is about 1685.3901625440. The cubic root of 2840540 is about 141.6229499865.

The spelling of 2840540 in words is "two million, eight hundred forty thousand, five hundred forty".